Listed below are resources that provide data and analysis of monetary donations in politics:
This information is listed in the Political Science Research Guide created by USC Librarian Robert Labaree, https://libguides.usc.edu/POSC. Descriptions of resources are adapted or quoted from vendor websites and from Jeremy Darrington's American Politics Research Guide, Princeton University Libraries.
Below are the official sites for finding lobbying documents and information for all members of Congress, including incumbents seeking re-election.